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authorYuwei Wang <wangyuweihx@gmail.com>2022-06-29 11:48:31 +0300
committerPaolo Abeni <pabeni@redhat.com>2022-06-30 14:14:35 +0300
commitc381d02b2fd5f82d2207db1b9b25ff60d0d9c27c (patch)
tree9edc706e72e6d744f193d348ff5fa17c3574c2f6 /kernel/sysctl.c
parentd19b4c52f7c99fdc5198a6f5885ba818245966cd (diff)
downloadlinux-c381d02b2fd5f82d2207db1b9b25ff60d0d9c27c.tar.xz
sysctl: add proc_dointvec_ms_jiffies_minmax
add proc_dointvec_ms_jiffies_minmax to fit read msecs value to jiffies with a limited range of values Signed-off-by: Yuwei Wang <wangyuweihx@gmail.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'kernel/sysctl.c')
-rw-r--r--kernel/sysctl.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index e52b6e372c60..85c92e2c2570 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1237,6 +1237,30 @@ static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
return 0;
}
+static int do_proc_dointvec_ms_jiffies_minmax_conv(bool *negp, unsigned long *lvalp,
+ int *valp, int write, void *data)
+{
+ int tmp, ret;
+ struct do_proc_dointvec_minmax_conv_param *param = data;
+ /*
+ * If writing, first do so via a temporary local int so we can
+ * bounds-check it before touching *valp.
+ */
+ int *ip = write ? &tmp : valp;
+
+ ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data);
+ if (ret)
+ return ret;
+
+ if (write) {
+ if ((param->min && *param->min > tmp) ||
+ (param->max && *param->max < tmp))
+ return -EINVAL;
+ *valp = tmp;
+ }
+ return 0;
+}
+
/**
* proc_dointvec_jiffies - read a vector of integers as seconds
* @table: the sysctl table
@@ -1259,6 +1283,17 @@ int proc_dointvec_jiffies(struct ctl_table *table, int write,
do_proc_dointvec_jiffies_conv,NULL);
}
+int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct do_proc_dointvec_minmax_conv_param param = {
+ .min = (int *) table->extra1,
+ .max = (int *) table->extra2,
+ };
+ return do_proc_dointvec(table, write, buffer, lenp, ppos,
+ do_proc_dointvec_ms_jiffies_minmax_conv, &param);
+}
+
/**
* proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
* @table: the sysctl table
@@ -1523,6 +1558,12 @@ int proc_dointvec_jiffies(struct ctl_table *table, int write,
return -ENOSYS;
}
+int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{